The fire destroyed the Bonner property on Monday morning, a blaze authorities are now investigating as arson.
While police are yet to formally identify the bodies, neighbours have told a number of publications a mother lived in the north Canberra home with her two children.
Photos from the scene show a child’s tricycle sitting in the backyard.
The suburban street was reopened this morning but police have kept the house cordoned off and have set up screens out the front of the home.
A crime scene was established after the badly-burned bodies were found inside.
“Police attended a house which was engulfed by flames,” ACT Police Detective Superintendent Scott Moller told reporters yesterday evening.
“ACT Fire & Rescue extinguished those flames and secured the premises for us.
“Shortly after a structural assessment was completed, police entered the premises and searched the house.
“During that search, police tragically located three persons that were deceased.”
Rachel Collins, who lives on a nearby street, told The Canberra Times, she saw the house go up in flames quickly.
“My husband left for work at 8.30, there was no sign of smoke, nothing, because I called him as soon as I saw something. I left at 17 minutes to 9 and it was up in smoke,” she said.
“I could see it coming out of the roof. So within a 13-minute period that house had gone from being nothing to being in flames.”
A forensics team will conduct further investigations today.